You can actually use either, but second cut rends a lot of excess fat during cooking. (toriavey.com)
If you have a lot of excess fat around your waistline, you have to take some steps to get rid of it, as this is the most dangerous type of fat — it lies deep inside your abdomen, surrounding your internal organs and increases your risk of cardiovascular disease, insulin resistance and type 2 diabetes. (fitnessandpower.com)
If you have a lot of excess fat, it's highly recommendable to eat less than your body uses, i.e. create a caloric deficit. (fitnessandpower.com)